关键词: 近直立煤层, 爆破卸压, 微震, 冲击地压

Abstract: In order to study the effect of blasthole arrangement on blasting pressure relief in the steeply-inclined coal seam, three kinds of pressure-relief blasting projects were carried out on the +450 horizontal No. B3+6 fully mechanized top-coal caving face of Wudong coal mine. The comparison found that: for the shallow rock, after the blastholes were encrypted, the daily average energy and frequency of microseismic events decreased significantly, and the stress concentration in the vicinity of the working face weakened, and the pressure relief effect was improved. Compared with the deep body boreholes, the alternating arrangement of shallow holes and shallow rock boreholes was dominant, the stage pressure relief project is more effective in reducing the stress of the working face, in which the pressure drop is more obvious in the areas where the shallow holes are alternately arranged. The research results have certain guiding significance for further improving the prevention and control of rockburst.